SimplyInfo » Entries tagged with "unit 3"
Fukushima Trench Freezing Failures & Tactics Technical Report
Update: Added table of sea water data at the end and another TEPCO handout on the work released this week. TEPCO admitted a few weeks ago to METI that the trench freezing operation underway for units 2 and 3 was not working. TEPCO initially provided few details but did give a detailed report to METI. Today TEPCO released some ideas for how they intend to overcome the problems but didn’t make the details of the problems … Read entire article »
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Fukushima Unit 3 Demolition Spread Contamination 50km, Multiple Instances
More information has come out about the contamination caused by the demolition work on unit 3. It was not the government, or TEPCO who found this was happening. Researchers from Kyoto University confirmed the problem in March 2014 and alerted the government. Had the university not been operating dust monitors on a regular basis, this issue likely would not have been admitted or known. 4 trillion becquerels were released in the August 19th incident and spread … Read entire article »
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4 Trillion Becquerels Released Over 4 Hours From Unit 3 During Demolition
Yahoo News is reporting that over a 4 hour period of demolition work on unit 3 in August 2013, 4 trillion becquerels of contamination were disbursed into the air. Monitoring stations at Futaba, Namie and at the plant were used to make the estimate. It was estimated that a radiation rate of .04 bq/cm was deposited on nearby lands. Plant monitoring for the related dates at Fukushima Daiichi didn’t show significant changes to the monitoring … Read entire article »
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TEPCO Contaminated Nearby Town During Unit 3 Demolition
TEPCO has admitted to re-contaminating the area around Minamisoma after being confronted by the agriculture ministry. Rice in Minamisoma was found to be over the government radiation limit of 100 bq/kg. Upon further inspection the ministry found it was the outside of the rice plants that had the most contamination rather than the rice kernel itself. This indicated contamination fell on the plants rather than being taken up from the soil. Now TEPCO is admitting on … Read entire article »
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TEPCO Submits Plan For Fuel Removal At Unit 3 Fukushima Daiichi
TEPCO submitted plans to the NRA for spent fuel removal from unit 3. This included more detail on how they intend to install a cover and remove transit casks from the building. The defueling building cover bridges the original reactor building, putting the load on the existing scaffolding system and an accessory building. This structure avoids contact with the reactor well, known to have high radiation levels. TEPCO did not mention any measures to prevent radiation issues from the fuel canal between the reactor and the spent fuel pool. They also do not mention anything about worker exposures or how human work would be conducted. Estimated radiation levels in the area are as high as 1 sievert/hour. The fuel casks would be moved out of the pool to the left side … Read entire article »
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TEPCO Begins Decontamination Of Unit 3 First Floor
TEPCO has begun the further decontamination of the first floor of unit 3. Robots Meister and Sora are doing the work, Meister is hooked to a vacuum collector rig outside the building. Misc debris not already removed is being collected and some surface cleaning is being done. This is an attempt to lower contamination levels further to allow human sustained entry into the building. http://www.tepco.co.jp/en/nu/fukushima-np/handouts/2014/images/handouts_140620_06-e.pdf This article would not be possible without the extensive efforts of the … Read entire article »
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Fukushima Unit 3 Spent Fuel Pool Debris Removal Progress
TEPCO has progressed on removing debris from the unit 3 spent fuel pool. The current work is to dismantle the fuel handling crane piece by piece and remove it from the pool. The trolley, main hoist and roof trussing that was above the crane have already been removed. Once the last of the fuel handling crane is removed work will begin to remove debris from the cask handling area of the pool. Cask area debris … Read entire article »
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Fukushima Unit 3 Leak Found, Unit 1 Loses Containment Pressure Monitoring
Two significant admissions were made by TEPCO at the end of the week. Unit 3 Scope work into the unit 3 MSIV room found multiple locations where steam pipes were leaking. The handout appears to show locations on the joints of the pipes before the main steam isolation valves where they found leaks. The section where these pipes go through the containment wall have rust traces as if those locations may also be leaking. These are obviously … Read entire article »
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Fukushima Unit 3; MSIV Shows Considerable Damage
TEPCO completed an initial inspection of the unit 3 MSIV room that houses valves critical to shutting down the reactor. The room showed considerable damage compared to the same room in unit 2. The damage indicates the room likely had high heat and large amounts of steam for an extended period of time. Water in the room appeared to be leaking from a lower location where the steam pipes are located and not from a … Read entire article »
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Fukushima Unit 3 Crane Leaks Oil Into Spent Fuel Pool
The refueling crane that crashed into the spent fuel pool of unit 3 has begun leaking oil into the pool. Work is underway to remove the crane from the pool, this may have caused the leak. TEPCO shut off the cooling system for the pool yesterday and reports today that the temperatures in the pool have not increased in any significant way. They have not declared a plan to deal with the oil in the … Read entire article »
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Fukushima Unit 3 Shield Wall Installation Begins
Decontamination work and installation of a shield wall around the reactor well has begun at unit 3 Fukushima Daiichi. The colored sections on the diagram indicate where various types of decontamination will be attempted before the shield wall will go up around the reactor well. The hope is to cut down on radiation from the area so workers can be closer to the refueling floor and to cut down on radiation impact it is causing … Read entire article »
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Fukushima Unit 3 Fuel Pool Debris Removal Progress
TEPCO has accomplished some debris removal from the spent fuel pool as documented in this report. Earlier in 2014 work was conducted to remove debris that was primarily rebar and handrails. Work in March began to focus on removal roof trussing so they could get closer to removing the fuel handling machine and mast. The pool is still quite full of fine debris on top of the fuel racks as can be seen in the photo. … Read entire article »
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Fukushima 3rd Anniversary; Technical Report Unit 3
Unit 3 saw considerable work take place in the last year. The torus of this unit was considered to be leaking as are the other two that suffered meltdowns. TEPCO doesn’t elaborate where and how it is leaking. TEPCO called the unit 3 torus “mostly sound” but didn’t say what way it isn’t sound. Debris removal began on the refueling floor. One piece of debris read 540 mSv/h. TEPCO didn’t show a photo of the specific piece … Read entire article »
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High Levels Of Radiation Found In Fukushima Unit 3 Turbine Building
TEPCO released radiation readings for water inside the unit 3 turbine building this week. The readings were from December 2013. TEPCO used them as a comparison to show a water leak elsewhere in the building was not reactor water. The readings themselves are a rare find as TEPCO doesn’t usually release this data. The readings are disturbingly high. Reference: No. 3 aircraft turbine building underground reservoir water analysis result （ H25/12/6 sampling ）: Cesium-134: 7,300,000 Bq/L Cesium-137: … Read entire article »
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Fukushima Unit 3 Concrete Reactor Cover Damaged
TEPCO has admitted that the concrete reactor well cover on unit 3 has been damaged. They floated two possible causes. One being the explosion itself, the other being the overhead crane falling on the covers as part of the blast. The crane portion that holds the hook is what is assumed to have done the damage. The center panel of the concrete cover is broken and sunken. TEPCO’s report guesses that the lower cover layers are … Read entire article »
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Fukushima Unit 3 Spent Fuel Pool Debris Removal Update
METI has reported some progress and a plan for removing debris out of the unit 3 spent fuel pool. Initial work already in progress includes removal of the steel pool cover and then any rebar than can easily be removed, this work is already underway. Then work will progress in this order: 1.(④, ⑤, ⑥, ⑦) removal mast , roof truss material 2 . Removal of FHM (fuel handling machine) (⑧) 3 . Removal of FHM west end … Read entire article »
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Fukushima Unit 3 Equipment Hatch Damaged
The upper floors of the equipment hatch at unit 3 were found to have some damage on a recent inspection. METI’s report estimates a 50% reduction in seismic resistance in this area. They did not indicate that this would change the plan for installation of the defueling cover but this area currently is planned to be in use for that work. http://www.meti.go.jp/earthquake/nuclear/pdf/131226/131226_01ff.pdf This article would not be possible without the extensive efforts of the SimplyInfo research team Join … Read entire article »
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Fukushima Unit 3 MSIV Room Door Blown In
News 24 is reporting that TEPCO has admitted that the steel door for the MSIV room was found to be blown inward. Due to high radiation levels humans can not go in to retrieve the door and robots are incapable of removing the object. This is cited as the reason for attempting an inspection into the room from the floor above. TEPCO had previously indicated they thought there was possibly standing water in the room, with … Read entire article »
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More On Fukushima Unit 3, TEPCO Fails To Explain Levels
TEPCO released two new handouts on the leak at unit 3. This gives some additional insight but still fails to explain a number of critical issues. Handout 1: http://www.tepco.co.jp/nu/fukushima-np/handouts/2014/images/handouts_140122_05-j.pdf Handout 2: http://www.tepco.co.jp/en/nu/fukushima-np/roadmap/images/l140120_01-e.pdf TEPCO does not provide any data to explain their claim for where the water level in containment is. They cite using pressure readings to determine this but give no information to show how they came to such a conclusion. Available pressure readings show a single sensor for the … Read entire article »
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TEPCO Thinks Water Leak At U3 Has Reduced
TEPCO thinks that the water leak at unit 3 has reduced in volume. They claim nothing has changed in reactor data or water injection rates. They gave no other explanation but did release a new video of the leak area. http://www.youtube.com/watch?v=cEcq1UmBnXQ&feature=youtu.be This article would not be possible without the extensive efforts of the SimplyInfo research team Join the conversation at chat.simplyinfo.org All content is copyright SimplyInfo.org. Content cited, quoted etc. from other sources is under the respective rights of … Read entire article »
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TEPCO Admits Containment Failure Possible Source Of U3 Leak
NHK is reporting some newer admissions from TEPCO on the unit 3 water leak found over the weekend. They continue to say they think it is a leak from containment but now admit there could be a failure of one of the steam pipe penetrations. “The officials suspect the water is leaking from around an opening for a steam pipe in the wall of the containment vessel. They said the extra space around the opening had been tightly … Read entire article »
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Unit 3 New Water Leak; TEPCO Explanations Fail To Identify Source
TEPCO has reported a leak in unit 3 coming out of the area of the steam tunnel where the main steam isolation valves are. Initially TEPCO reported this as being rainwater with no further proof how they came to that conclusion. Today they claimed it is water from containment without further clarification. A number of people have suggested it may be the MSIV valve or steam line leaking and have concerns that it broke during the … Read entire article »
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Leak At Unit 3 Found To Be High Radiation Water
TEPCO announced a leak in unit 3 near the steam tunnel area over the weekend. They initially tried to blame it on rainwater. Now TEPCO has released radiation readings for the leaking water. The radiation levels are considerable and TEPCO claims they are higher than the levels in the cooling injection water. The main steam isolation valves and also the incoming feedwater lines are in this tunnel. From TEPCO’s press release (machine translated) For water leakage in … Read entire article »
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Unit 3 Fukushima Daiichi Reactor Data
There have been a number of unsubstantiated rumors going around about “new problems” at unit 3. Information is always better than rumor. We pulled the reactor data for the last week for unit 3. Temperatures are within expected and historical levels. Xenon 135 is monitored as an indicator of fission and is consistent at levels well below anything that would indicate anything outside of normal for the state of unit 3. The steam at unit … Read entire article »
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TEPCO Begins Seismic Review Of Unit 3
TEPCO has begun a seismic review of the condition of unit 3. With the debris removed from the refueling floor, efforts have begun to inspect the building for more damage. They will begin reviewing the refueling floor with a camera hung from a crane tomorrow. TEPCO also intends to do similar work on all levels of the building but does not clarify how they intend to reach some portions of the building that fell in … Read entire article »
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Unit 3 Spent Fuel Pool; Debris Removal Preparation Begins
Kyodo News announced yesterday that preparations are underway to remove the debris from the unit 3 spent fuel pool at Fukushima Daiichi. The debris in unit 3′s spent fuel pool is much more excessive and complicated than unit 4. In unit 3′s pool is a tangle of rebar and concrete along with the refueling crane. The refueling crane apparently fell in the pool during the explosion. One end landed on the fuel racks. Along with the … Read entire article »
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Debris Removal At 1st Floor Unit 3 Fukushima Underway
TEPCO mentions that debris removal work on the 1st floor of unit 3 is underway. The work had been on various planning documents but is now confirmed to be ongoing. The work is being done by way of robotic equipment. The confirmation came as the SoRa robot developed an oil leak. This debris removal will help both robots and workers gain entry to more of the building. SoRa was built by Hitachi-GE. TEPCO does not state … Read entire article »
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Unit 3 Leaking Alpha Radiation
TEPCO put out a report on alpha emitters found in the gas removal systems for units 1-3. This appears to be the first reporting of this. Units 1 and 2 were tested and said to be below detection. Unit 3 is leaking a certain amount of alpha emitters out the gas removal system and is likely leaking the same out the damaged reactor well on the top. Some of the isotopes listed are expected. What appears unusual is that only unit 3 is cited as detecting them. Since unit 3 was running a partial load of MOX plutonium fuel is this a roundabout admission by TEPCO that 3 is leaking detectable amounts of plutonium due to the fuel mix? Since TEPCO plays coy, or possibly lazy and only lists “all alpha” radiation … Read entire article »
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TEPCO Admits Containment Failure At Unit 3
Most in the know have strongly suspected this since 2011 but TEPCO finally admitted this today. Unit 3′s containment structure is failed via the reactor well. This came about as the press questioned TEPCO about the ongoing steam leak source at unit 3. TEPCO had been declaring it to be rain leaking onto a warm structure up until now. Ex-SKF translates this from the TEPCO PR representative at today’s press conference: “it was around this area where the steam was coming from inside the reactor’s Containment Vessel right after the accident [explosion of Reactor 3 on March 14, 2011"] LaPrimavera at Ex-SKF found this perplexing as he didn’t remember TEPCO admitting this in 2011 while they today act like everyone knew. He is right, TEPCO never admitted this and the one statement about … Read entire article »
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UPDATE: New Radiation Readings At Unit 3 Reactor Well
TEPCO released some additional radiation readings for the reactor well of unit 3 today. They can be seen below on an overlay of the heat image released previously. These readings show that the high readings released yesterday are not isolated and that the entire reactor well area is quite high in radiation. There does appear to be some focal effect coming off of the source of the hot spot (temperature) area. TEPCO’s updated report http://www.tepco.co.jp/en/nu/fukushima-np/handouts/2013/images/handouts_130724_05-e.pdf This article would not be possible without the extensive efforts of the SimplyInfo research team Join the conversation at chat.simplyinfo.org All content is copyright SimplyInfo.org. Content cited, quoted etc. from other sources is under the respective rights of that content owner. If you are viewing this page on any website other than www.simplyinfo.org (or www.fukuleaks.org) it may be plagiarized, please … Read entire article »
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TEPCO Releases Unit 3 Radiation Levels, Shows New Problem
TEPCO published this new document today that includes more radiation readings for the reactor well of unit 3. These new readings done as an overlay on the recent heat image really shows the problem. The highest readings are focused on the heat readings. The area near the spent fuel pool gate are higher and the location where the steam is leaking is elevated compared to the adjacent readings. This still requires more analysis to determine what may be going on beneath the thick concrete reactor well cover. The readings are all considerably high with many higher than what was found at unit 2. Unit 2 has been sealed off after TEPCO discovered extremely high levels of radiation were leaking out the blow out panel of the refueling floor at that unit. Unit … Read entire article »
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TEPCO Hides Unit 3 Data, Who Watches TEPCO?
After months of data about water and little else, TEPCO remains mum on unit 3. Considerable progress has been made in removing the debris on the refueling floor. This reveals what could be considerable information and evidence related to the meltdown and massive blast at unit 3. The last report on unit 3 was in late May when they installed a cover over the spent fuel pool. Since then the webcam at the plant shows the back wall and most of the tangle of debris has been removed. This process will reveal the state of the damaged side of the refueling deck and the condition of the reactor well components. What could be determined in 2011 was that the south side of the building’s upper floors had collapsed and considerable steam had … Read entire article »
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New Leak Found Near Unit 3 At Fukushima Daiichi
TEPCO is admitting to increased levels of radiation near unit 3. An increased amount of beta radiation and cesium was found today near the unit 3 intake canal in groundwater well #3. These levels increased since July 4th when beta was at “none detected” to 1400 bq/liter. http://www.tepco.co.jp/en/nu/fukushima-np/f1/smp/2013/images/2tb-east_13071201-e.pdf In addition to the well water increase, they found an elevated reading in a seawater piping trench just outside the unit 3 turbine building. The contamination levels inside the turbine buildings were all at about the same contamination level. TEPCO doesn’t mention exactly where in the turbine buildings they took those readings. What this testing showed is that something is creating contaminated water that is showing up at the seafront outside the turbine buildings and near unit 3. This is outside the previous thought … Read entire article »
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Unit 3 Fukushima Daiichi Debris Removal Near Completion
Debris removal has been ongoing during the last month as TEPCO attempted to distract the public with the leaking ponds issue. Photos below from the TEPCO webcam show the rapid progress in just the last few weeks. The image in early June shows the back wall structure is still in place and much of the roof trussing debris was still on top of the refueling floor. About 50% of the trussing and debris is gone compared to earlier in the month. Half of the back wall frame is removed. TEPCO has reported little or nothing since they did beam removal work on the spent fuel pool months ago. As unit 4 was cleared off TEPCO provided multiple updates and images of the complicated work to removal the refueling floor and reactor … Read entire article »
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Highly Radioactive Debris Found On Unit 3 Refueling Floor
TEPCO has announced that a piece of highly radioactive debris has been pulled off of the refueling floor of unit 3. The object read 540 mSv/h and was removed by robotic equipment. So far no photos of the object or description of where on the refueling floor it was found have been provided by TEPCO. Ex-SKF has full translations of the two TEPCO statements. We have been monitoring the progress of the refueling floor debris removal. As of last week they were nearing the area over the reactor well. These photos show where they were in the clean up last week. This article would not be possible without the extensive efforts of the SimplyInfo research team Join the conversation at chat.simplyinfo.org All content is copyright SimplyInfo.org. Content cited, quoted etc. from other sources is … Read entire article »
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Temporary Power Failure At Fukushima Daiichi, Not A Repeat From Last Week
Unit 3 lost power to the spent fuel pool cooling system yet again. So far no cause has been admitted and the other units are reported to still have power. The power system at unit 3 was out for about 3 hours before being restored. This incident is not building public confidence after a rat took out power to the plant in recent weeks. Read more: http://ajw.asahi.com/article/0311disaster/fukushima/AJ201304050069 http://www3.nhk.or.jp/nhkworld/english/news/20130405_26.html This article would not be possible without the extensive efforts of the SimplyInfo research team Join the conversation at chat.simplyinfo.org All content is copyright SimplyInfo.org. Content cited, quoted etc. from other sources is under the respective rights of that content owner. If you are viewing this page on any website other than www.simplyinfo.org (or www.fukuleaks.org) it may be plagiarized, please let us know. If you wish to reproduce any … Read entire article »
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Unit 3 Location Of Crane & Mast In Pool
In an attempt to better understand how the crane is situated in the spent fuel pool of unit 3 we developed some illustrations. Using various TEPCO reports, diagrams and photos we were able to estimate the location of both items within the spent fuel pool. The first flat map shows the crane location in green and the mast in pink per TEPCO’s original version of the map. The red blocks are known location of fuel based on a 2010 photo of the spent fuel pool. Additional fuel may have been offloaded into the pool since the photo was taken. The second image attempts to show both items in within the pool. This article would not be possible without the extensive efforts of the SimplyInfo research team Join the conversation at chat.simplyinfo.org All content is copyright … Read entire article »
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Analysis: Unit 3 Mast In Pool Inspection
TEPCO released a new video and handout of the unit 3 mast that fell deeper into the spent fuel pool. We have processed the video into about 200 still images that can be found here. The full video of the inspection can be found on our Youtube channel. TEPCO estimates one end of the mast landed along the east wall with the end resting on a control rod drive rack. The other end appears to be resting tangled in concrete and rebar debris on top of the fuel racks. Portions of the middle of the mast can be seen spanning above the fuel racks by a few inches. What appears to have been the structure that originally held the mast into the fuel crane can be seen partially down the mast. What is of … Read entire article »
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Unit 3 Daiichi Pool Accident Analysis
TEPCO announced this week that the 1.5 ton mast for the refueling crane fell into the pool and sank as they tried to remove debris from the pool. TEPCO has done some testing of radiation levels near the pool and does not think there was fuel damage based on not finding drastically elevated levels. The mast falling could create a couple of potential damage situations. It could fall and damage the fuel assemblies held in the pool. It could also damage or puncture the spent fuel pool metal liner causing a leak in the pool. The condition of the liner or the concrete pool has not been confirmed by TEPCO to date. The mast that fell looks like this under normal conditions. It has minimal connections to the refueling crane. TEPCO released these … Read entire article »
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New Paper: Gamma Radiation Damage To Fukushima Units 1- 4 Spent Fuel Pools
fukuleaks.org/web has released another new paper taking an in depth look into the ongoing challenges at the Fukushima Daiichi nuclear plant. This new work investigates the technical issues involved with the ongoing degradation of the spent fuel pools. Gamma radiation is an ongoing problem for the steel and concrete that composes the spent fuel pools. Aspects of the disaster have drastically changed that damage mechansim. The paper can be found online and also in PDF format for download or reading on book readers. Gamma Radiation Damage To Fukushima Units 1- 4 Spent Fuel Pools http://www.fukuleaks.org/web/?page_id=9353 This article would not be possible without the extensive efforts of the SimplyInfo research team Join the conversation at chat.simplyinfo.org All content is copyright SimplyInfo.org. Content cited, quoted etc. from other sources is under the respective rights of that content … Read entire article »
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